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What concrete database system? More advanced things like blob store are not part of "core" SQL query language - but they are highly vendor-specific - so we need to know what database this is for
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marc_sJun 15 '13 at 19:08

@marc_s: The DB I am going to use will probably be PostgreSQL, but my question does not intend to be database specific.
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PietroJun 22 '13 at 22:11